In response to below By definition it is impossible for a third harmonic to create more than two peaks per half cycle and if the distortion is only third harmonic then the peaks can never be separated by more than 45 deg. Even more confusion is created from the ambiguity of the statement which fails to state whether the lag is relating to the voltage or current waveform. a typical example of how not to inform and how to confuse.
On behalf Dave Fynn Technical Editor EMC Compliance Journal ----- Original Message ----- From: "KC CHAN [PDD]" <kcc...@hkpc.org> To: <emc-p...@majordomo.ieee.org> Sent: Friday, November 16, 2001 3:59 AM Subject: Class C harmonics testing > > For Class C harmonics testing(active input power <= 25 W), one requirement is as follows > > " the third harmonic current, ...; moreover, the waveform of the input current shall be such that it begins to flow before or at 60 deg., has its last peak (if there are several peaks per half period) before or at 65 deg and does not stop flowing before 90 deg, where the zero crossing of the fundamental supply voltage is assumed to be at 0 deg" > > Does anyone who can explain what is the purpose of this requirement? And what is the meaning of stop flowing before 90 deg. > > thank you > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave Heald davehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
